Hello everyone, I hope you're having a good time.
I'm facing a persistent issue with my Cisco 3750-48PS-S switch.
I've configured a DHCP pool for the 192.168.5.0/24 range with an excluded address range from 192.168.5.1 to 192.168.5.20.
Previously, I had a client with MAC address 00d2.34a7.59b1 that was manually assigned the IP address 192.168.5.16.
Now, I want to reassign this IP address (192.168.5.16) to a different client with MAC address 0045.48cf.b76. I've created a static DHCP binding for 192.168.5.16 to the new client's MAC address (0045.48cf.b76).
The output of show ip dhcp binding correctly shows the IP 192.168.5.16 bound to the new client's MAC address. However, the switch's ARP table still shows 192.168.5.16 mapped to the old client's MAC address (00d2.34a7.59b1). Pinging the new client at 192.168.5.16 is unsuccessful.
I've tried the following troubleshooting steps without success:
- Rebooting the switch.
- Clearing the entire ARP cache (clear arp-cache) on the switch.
- Clearing the specific ARP entry for 192.168.5.16.
- Clearing the specific DHCP binding for 192.168.5.16 and re-adding it.
Despite all these efforts, the ARP table remains unchanged, and I can't reach the new client.
Any suggestions on what else I can do?
I'm connected to the switch remotely. Unfortunately, I don't have access to the client to change its IP address mode from static to automatic, or to perform an IP release/renew via the command prompt on it.
